Question about Microsoft Windows XP Professional With Servise Pack 2 (e8503040) for PC

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Error 1721 A message comes up when I try to run selected updates. It is as follows: "Error 1731. There is a problem with this windows installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor." It then says "error while handling message." I didn't do this until I downloaded some upgrades to vista. What do I do now. J.P.

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  • dockneel Sep 02, 2008

    I've had the exact same problem with a brand new computer that upgraded to Vista's Ultimate. I've tried the programs original install package and then also the .msi version they suggested to use if the first didn't. Since the computer is new outta the box......I don't think I have any viruses!! This was the first program I wanted on the machine after windows updates (and of course the upgrade ot Ultimate. I used the 64 bit ultimate. I tried going back to the 32 bit but it wouldn't allow it.


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  • 336 Answers

Okay, lets begin. First off you were trying to install .msi packages? Second how new is the computer? Third how much stuff do you have on the computer? Finally forth Have you had any spyware/ viruses? I need this information to continue troubleshooting.


Posted on Aug 31, 2008

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I am trying to uninstall Cisco VPN and I get the windows installer error 1721, does anyone have any ideas on how to resolve this? thanks.

To resolvethis issue, perform the steps in the "Reregister the Windows Installer service" section. If youexperience the issue after you perform these steps, you may also have toperform the steps in the "Run System File Checker" section. Reregisterthe Windows Installer service loadTOCNode(2, 'resolution');The Windows Installer service manages the installation and removal ofprograms. The service applies a set of centrally defined setup rules during theinstallation process. These setup rules define the installation andconfiguration of the installed program. Windows Installer uses the Microsoftinstallation engine to install or remove programs. If the registration of theMicrosoft installation engine is corrupted, you may not be able to removeprograms that you have installed by using Windows Installer. In that case, youhave to unregister and reregister the Windows Installer service. To do this,follow these steps: Windows Installer
  1. Start your computer in Safe mode. To do this, follow these steps:
    1. Restart the computer.
    2. After the BIOS information is displayed, press F8.
    3. Use the DOWN ARROW key to select Safe Mode, and then press ENTER.
    4. Use the UP ARROW key and the DOWN ARROW key to select your computer, and then press ENTER.
  1. Log on to the computer as local administrator.
  2. Click Start, click Run, type cmd.exe, and then click OK.
  3. At the command prompt, type msiexec /unregister , and then press ENTER.
  4. At the command prompt, type msiexec /regserver, and then press ENTER.
  5. At the command prompt, type exit, and then press ENTER to close the command prompt.
  6. Remove the software program from Add or Remove Programs.

Jan 10, 2011 | Computers & Internet

1 Answer

Hi, when i try to install cisco vpn on my xp machine, it is throwing 1721 error.

Cisco VPN Client for Windows Vista, release, does not support the following:

blank.gifMicrosoft Windows NT, 98, and ME.

blank.gifSystem upgraded from Windows XP or earlier Windows operating systems to Vista. (Clean OS installation required.)

blank.gifCombination of Cisco Unified Video Advantage 2.1.2 and McAfee HIPS Patch 4 Build 688. To avoid system failures, uninstall either of these two applications, upgrade McAfee to the latest version, or use VPN Client 4.6.x.

blank.gifStart Before Logon.

blank.gifSmartCard authentication.

blank.gifIntegrated firewall


blank.gifAuto Update.

blank.gifTranslated Online Help. Online Help is provided only in English.

blank.gif64-bit Windows operating systems. For x-64 support, customers should explore with their Cisco sales representative the use of the next-generation Cisco AnyConnect VPN Client.

Nov 04, 2010 | Microsoft Windows XP Professional

1 Answer

When installing Java, at the end the message ''Error 1721. There is a problem with this windows Installer package''. A program required for this install to complete could not run. I've tried everything....

Try the steps laid out in this MS KB article about the installer service:

Reboot the computer, after it beeps start pushing F8. You should get a menu. Select Safe Mode and push enter.

Once Windows comes up click start and type in CMD (for Vista/7). Right-click cmd.exe and select "Run As Administrator". (For XP: click start then Run. Put in CMD and click OK).
Put in
msiexec /unregister

Then bring up the Run box again and put in
msiexec /register
Close the CMD box and reboot the PC, letting it boot as normal. Try the Java install process again. If it still doesn't work try the SFC command listed in the above KB article (which I can help with).

Jun 06, 2010 | Microsoft Windows Vista Home Premium...

1 Answer


lease refer to the following link to the Microsoft KB article to download the Windows Installer CleanUp Utility. When you go to download it do the following: 1. Select to Save and put it on your desktop
2. Now right click msicuu2.exe (for Windows Installer CleanUp Utility) and select to Run as administrator.
3. Follow the wizard to install the Windows Installer CleanUp Utility
4. Now try the update.

Oct 27, 2009 | Microsoft Computers & Internet

2 Answers

I cannot download the new windows updates-I get an error message 646 and cannot find out what that means

Try the following steps to install the update successfully.
Stop the services pertaining to Windows Update.
1. Click Start, click All Programs, click Accessories, right-click Command Prompt, and select Run as Administrator.
2. If you receive a notification from User Account Control simply click Continue.
3. At the command prompt, type the following commands and then press ENTER after each command.
net stop wuauserv
net stop bits
net stop cryptsvc
4. Please do not close the Command Prompt window.

Rename folders pertaining to Windows Update
At the command prompt, type the following commands and then press Enter after each command:
ren %systemroot%\System32\Catroot2 Catroot2.old
ren %systemroot%\SoftwareDistribution SoftwareDistribution.old

Start services pertaining to Windows Update.
net start wuauserv
net start bits
net start cryptsvc
Close the Command Prompt window.

Download the standalone package file of the update “KB967043”
and install it.
Visit the following link to download the update:
Restart the computer once the update is installed.
Let me know if this worked.

Oct 15, 2009 | Microsoft Windows Vista Home Premium with...

3 Answers

Windows update KB954430 is always in the queue to be installed.

I had the same problem with Vista. You need to manually download the patch and run as administrator. It has worked several times with me. Try these steps:

  1. Download the patch KB954430 manually from microsoft. Save it temporarily on you're desktop. Just go to

    or if you don't like clicking on links, google "KB954430" and click on the second link labeled "Download details: MSXML 4.0 Service Pack 2 (KB954430)" at

  2. Close Internet Explorer
  3. Right click on the KB954430 installation file that was just downloaded to your desktop (msxml4-KB954430-enu.exe)
  4. Select 'Run as Administrator'
  5. If you are asked, select 'Run' then 'Continue'.
  6. Select 'Next'
  7. Click on the 'Remove' icon, then select 'Remove'
  8. Select 'Finish'
  9. Follow steps 3-6 again.
  10. Accept License Agreement then click 'Next'
  11. Click 'Next' again
  12. Click 'Install Now' icon
  13. Click 'Finish'
And you're done. Hope this helps.


Dec 27, 2008 | Microsoft Windows XP Professional With...

1 Answer

Error 1721

Try the following regardless of the software as this is the common error message provided by Microsoft. Of course this won't rule out either a corrupt installer or incompatibility's
  1. Disable/Configure any anti-spyware or anti-virus software on your system during installation process. For example: Spybot Search and Destroy Program or Norton Anti-Virus
  2. Check to see if any spyware or adware is installed on your system blocking the completion of install process.
  3. Check to see if you find any unwanted entry in Add/Remove Programs or Internet Explorer - Add/On's section (Tools - Internet Options - Programs -> Manage Add On's). If you found one, remove/disable this entry.
  4. On Windows Vista, disable UAC (User Access Control) feature for your account

Aug 27, 2008 | Microsoft Windows Vista Ultimate Edition

1 Answer

Error 1721

This page applys to XP,

but the solution should be similar. If you've done the registering, the next suspect would be something corrupt in your VPN package.

Try a fresh download or copy of it, and be sure you run as administrator during the install.

Jun 28, 2008 | Microsoft Windows Vista Ultimate Edition

1 Answer

Getting error message in trying to run TurboTax 2007

Try re-installing the software.. it is possible that something messed up when installing/updating.. Also make sure that any updates you apply are for windows XP and not windows Vista

Apr 06, 2008 | Microsoft Windows XP Home Edition

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